rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P5561/1:b..l
rcu: 	(detected by 1, t=10503 jiffies, g=184893, q=989 ncpus=2)
task:crond           state:R  running task     stack:23328 pid:5561  tgid:5561  ppid:1      task_flags:0x400000 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5298 [inline]
 __schedule+0x15dd/0x52d0 kernel/sched/core.c:6911
 preempt_schedule_irq+0x4d/0xa0 kernel/sched/core.c:7238
 irqentry_exit+0x599/0x620 kernel/entry/common.c:239
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:rcu_read_lock_held_common kernel/rcu/update.c:113 [inline]
RIP: 0010:rcu_read_lock_held+0x20/0x50 kernel/rcu/update.c:349
Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 53 e8 a6 a8 05 0a 85 c0 74 26 31 db e8 db f2 00 00 84 c0 74 20 e8 22 38 01 00 84 c0 <74> 17 48 c7 c7 e0 e5 75 8e be ff ff ff ff 5b e9 3c a5 05 0a bb 01
RSP: 0018:ffffc900033f7ae8 EFLAGS: 00000202
RAX: 1ffffffff1cec801 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: ffffffff8c27d0e0 RDI: ffff8880b873bde8
RBP: 0000000000000001 R08: ffffffff823c2e52 R09: ffffffff8e75e5e0
R10: dffffc0000000000 R11: fffff94000227887 R12: 0000000000000100
R13: dffffc0000000000 R14: 0000000000044f10 R15: ffff88801b800000
 lookup_page_ext mm/page_ext.c:258 [inline]
 page_ext_get+0x1b0/0x2e0 mm/page_ext.c:532
 __reset_page_owner+0x28/0x1f0 mm/page_owner.c:306
 reset_page_owner include/linux/page_owner.h:25 [inline]
 __free_pages_prepare mm/page_alloc.c:1433 [inline]
 __free_frozen_pages+0xc2b/0xdb0 mm/page_alloc.c:2978
 __slab_free+0x263/0x2b0 mm/slub.c:5573
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:350
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4538 [inline]
 slab_alloc_node mm/slub.c:4866 [inline]
 kmem_cache_alloc_noprof+0x2bc/0x650 mm/slub.c:4873
 alloc_filename fs/namei.c:142 [inline]
 do_getname+0x2e/0x250 fs/namei.c:182
 getname include/linux/fs.h:2512 [inline]
 class_filename_constructor include/linux/fs.h:2539 [inline]
 do_sys_openat2+0xca/0x200 fs/open.c:1365
 do_sys_open fs/open.c:1372 [inline]
 __do_sys_openat fs/open.c:1388 [inline]
 __se_sys_openat fs/open.c:1383 [inline]
 __x64_sys_openat+0x138/0x170 fs/open.c:1383
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9ed8be3c3a
RSP: 002b:00007ffc3a0d6508 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000562face182a0 RCX: 00007f9ed8be3c3a
RDX: 0000000000080000 RSI: 00007f9ed8c8045a RDI: 00000000ffffff9c
RBP: 0000000000000008 R08: 0000000000000008 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000206 R12: 00007f9ed8c7e7f4
R13: 00007f9ed8c7e7f4 R14: 0000000000000001 R15: 0000000000000020
 </TASK>